html body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #e0e5ed;
  font-family: "Arial Narrow Bold", sans-serif;
}
.container {
  width: 350px;
  height: 700px;
  border-radius: 20px;
  background: #e0e5ed;
  box-shadow: 12px 12px 24px #c3c7ce, -12px -12px 24px #fdffff;
  padding-bottom: 20px;
  display: grid;
  grid-template-rows: 30px 60px;
  .topbar {
    padding: 0px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 10px;
  }
  .title {
    margin-top: 20px;
    text-align: center;
    font-size: 20px;
    color: #ff9900;
    font-weight: bold;
    text-shadow: 2px 2px rgb(151, 145, 145);
  }
  .calculator {
    display: grid;
    grid-template-columns: repeat(4, 60px);
    grid-template-rows: 120px, repeat(5, 60px);
    justify-content: center;
    align-content: end;
    gap: 20px;
    .btn {
      outline: none;
      border: none;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      font-size: 16px;
      background: linear-gradient(145deg, #f0f5fe, #caced5);
      box-shadow: 8px 8px 16px #bec3c9, -8px -8px 16px #ffffff;
      &:hover {
        background: linear-gradient(145deg, #caced5, #f0f5fe);
        box-shadow: 6px 6px 12px #bec3c9, -6px -6px 12px #ffffff;
      }
    }
    .btn_click {
      outline: none;
      border: none;
      border-radius: 50%;
      width: 60px;
      height: 60px;
      font-size: 16px;
      background: linear-gradient(145deg, #f0f5fe, #caced5);
      box-shadow: 8px 8px 16px #bec3c9, -8px -8px 16px #ffffff;
      &:hover {
        background: linear-gradient(145deg, #caced5, #f0f5fe);
        box-shadow: 6px 6px 12px #bec3c9, -6px -6px 12px #ffffff;
      }
    }
    .btn0 {
      width: 140px;
      height: 60px;
      border-radius: 30px;
      grid-column-start: 1;
      grid-column-end: 3;
      &:hover {
        background: linear-gradient(145deg, #caced5, #f0f5fe);
        box-shadow: 6px 6px 12px #bec3c9, -6px -6px 12px #ffffff;
      }
    }
    .btn1 {
      color: #ff9900;
      // font-weight: bold;
    }
    .txt {
      margin-bottom: 20px;
      grid-column-start: 1;
      grid-column-end: 5;
      border: none;
      outline: none;
      height: 60px;
      border-radius: 10px;
      background: #e0e5ed;
      display: flex;
      justify-content: flex-end;
      align-items: flex-end;
      font-size: 48px;
      // box-shadow: inset 5px 5px 10px #c3c7ce, inset 0px 0px 10px #fdffff;
    }
  }
}
